1/* 2 * Copyright 2010 Tilera Corporation. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 11 * NON INFRINGEMENT. See the GNU General Public License for 12 * more details. 13 */ 14 15#ifndef _ASM_TILE_DMA_MAPPING_H 16#define _ASM_TILE_DMA_MAPPING_H 17 18#include <linux/mm.h> 19#include <linux/scatterlist.h> 20#include <linux/cache.h> 21#include <linux/io.h> 22 23/* 24 * Note that on x86 and powerpc, there is a "struct dma_mapping_ops" 25 * that is used for all the DMA operations. For now, we don't have an 26 * equivalent on tile, because we only have a single way of doing DMA. 27 * (Tilera bug 7994 to use dma_mapping_ops.) 28 */ 29 30#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) 31#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) 32 33extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, 34 enum dma_data_direction); 35extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, 36 size_t size, enum dma_data_direction); 37extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, 38 enum dma_data_direction); 39extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg, 40 int nhwentries, enum dma_data_direction); 41extern dma_addr_t dma_map_page(struct device *dev, struct page *page, 42 unsigned long offset, size_t size, 43 enum dma_data_direction); 44extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address, 45 size_t size, enum dma_data_direction); 46extern void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, 47 int nelems, enum dma_data_direction); 48extern void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 49 int nelems, enum dma_data_direction); 50 51 52void *dma_alloc_coherent(struct device *dev, size_t size, 53 dma_addr_t *dma_handle, gfp_t flag); 54 55void dma_free_coherent(struct device *dev, size_t size, 56 void *vaddr, dma_addr_t dma_handle); 57 58extern void dma_sync_single_for_cpu(struct device *, dma_addr_t, size_t, 59 enum dma_data_direction); 60extern void dma_sync_single_for_device(struct device *, dma_addr_t, 61 size_t, enum dma_data_direction); 62extern void dma_sync_single_range_for_cpu(struct device *, dma_addr_t, 63 unsigned long offset, size_t, 64 enum dma_data_direction); 65extern void dma_sync_single_range_for_device(struct device *, dma_addr_t, 66 unsigned long offset, size_t, 67 enum dma_data_direction); 68extern void dma_cache_sync(void *vaddr, size_t, enum dma_data_direction); 69 70static inline int 71dma_mapping_error(struct device *dev, dma_addr_t dma_addr) 72{ 73 return 0; 74} 75 76static inline int 77dma_supported(struct device *dev, u64 mask) 78{ 79 return 1; 80} 81 82static inline int 83dma_set_mask(struct device *dev, u64 mask) 84{ 85 if (!dev->dma_mask || !dma_supported(dev, mask)) 86 return -EIO; 87 88 *dev->dma_mask = mask; 89 90 return 0; 91} 92 93#endif /* _ASM_TILE_DMA_MAPPING_H */ 94